WO1995010386A1 - Procede et dispositif pour l'usinage de pieces par faisceau laser - Google Patents

Procede et dispositif pour l'usinage de pieces par faisceau laser Download PDF

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Publication number
WO1995010386A1
WO1995010386A1 PCT/DE1994/000971 DE9400971W WO9510386A1 WO 1995010386 A1 WO1995010386 A1 WO 1995010386A1 DE 9400971 W DE9400971 W DE 9400971W WO 9510386 A1 WO9510386 A1 WO 9510386A1
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WO
WIPO (PCT)
Prior art keywords
workpiece
arc
electrode
laser beam
laser radiation
Prior art date
Application number
PCT/DE1994/000971
Other languages
German (de)
English (en)
Other versions
WO1995010386B1 (fr
Inventor
Ralf Imhoff
Joachim Berkmanns
Eckhard Beyer
Klaus Behler
Martin Funk
Georg Kalla
Axel Zwick
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Publication of WO1995010386A1 publication Critical patent/WO1995010386A1/fr
Publication of WO1995010386B1 publication Critical patent/WO1995010386B1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/0665—Shaping the laser beam, e.g. by masks or multi-focusing by beam condensation on the workpiece, e.g. for focusing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
    • B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
    • B23K28/02—Combined welding or cutting procedures or apparatus

Definitions

  • the invention relates to a method for machining workpieces with laser radiation, which is focused on the relatively moved workpiece and causes ionization of the material, an arc being used in addition to the laser radiation in the region of the workpiece exposed to laser radiation becomes.
  • a method with the aforementioned features is known from US 45 07 540. It is used to couple the energy of the arc in addition to the energy of the laser beam. Accordingly, the welding depth and the seam width can be influenced. In particular, there are savings in the effort required for the laser at greater welding depths.
  • this known laser / arc welding method is used in practice, the arc may remain at its burned-in location, so that the laser welding point and the arc welding point fall apart more or less. In any case, the desired exact superimposition of both welds then no longer results, which results in the formation of an undesired seam shape or seam cross-sectional shape.
  • the invention is therefore based on the object of improving a method with the features mentioned at the outset, that the welding points of the laser and the arc always coincide and therefore the predetermined seam formation results.
  • This object is achieved in that an arc ignition with intensity-modulated and / or pulsed laser radiation and / or with a pulsed and / or modulated electrode voltage is carried out, that the arc extinguishes itself after its ignition or its electrode voltage is below the burner voltage is reduced, and that the arc is ignited again.
  • the method can not only be carried out during welding, but also during cutting, ablation and surface treatment.
  • surface treatment refers to remelting, alloying, coating and any other heat treatment of a workpiece surface.
  • the combination of laser and arc can be used in the same form.
  • the beam is formed in the usual way.
  • the method is advantageously carried out in such a way that the arc with the aid of laser radiation is dependent on the relative advance of the workpiece and the scanning speed of the laser beam over the workpiece. leads.
  • a sheet is scanned with the laser beam, the arc being formed only at those points which are irradiated with laser radiation.
  • the modulation and / or pulsation of the laser radiation as well as the pulsation and / or modulation of the electrode voltage make it possible for the laser beam and the arc together to act only on those processing points on the workpiece surface which are irradiated by the laser radiation, the laser radiation pre-ionization caused by the beam forces the arc onto the processing point determined by the laser beam.
  • the weld seam has a cross-section which is characterized by a clear cup or tulip shape.
  • this known method it cannot therefore be avoided that the different depths of action of the individual methods running one after the other at a processing point remain clearly recognizable.
  • the seam cross sections melted by the laser beam remain comparatively narrow, so that difficulties arise with the use of such a method in workpieces in which, for example, the edge formation is uneven over the entire workpiece height, as a result of which the workpieces are butt-welded Impact can not be reliably performed on those edge sections that are further apart than the cross section melted by the laser beam.
  • the invention is therefore also based on the object of carrying out the method with the aforementioned features in such a way that the seam width is increased not only in the region on the laser beam side but also over the entire seam depth.
  • the electrode end of the non-melting electrode is arranged so close behind the laser beam in the welding direction that the arc enters the steam channel using the expansion of the steam channel opening which is present against the relative feed direction. It is important for this process that the Wolf ram inert gas process or a process with a non-melting electrode is used, the end of which is guided above the workpiece at a short distance from the laser beam, in the welding direction behind the laser beam.
  • the electrode geometry cannot be changed during operation, so that the electrode does not have to be adjusted in its longitudinal direction due to erosion and the welding head structure can be slim.
  • the electrode is guided together with the laser beam in such a way that the arc enters the steam channel from above the workpiece.
  • the asymmetry of the steam channel opening is used, which is enlarged against the relative feed direction.
  • the arc essentially passes unhindered by the material behind the laser beam or the axis of the laser beam into the depth of the steam channel, where it interacts with the cut front and helps to achieve the desired seam width.
  • the arc therefore acts essentially on the welding front and accordingly ensures an increase in the seam width even at greater seam depths.
  • a correspondingly strong focusing of the laser beam makes it possible to achieve large welding depths with sufficiently wide seam cross sections, with which workpieces can also be welded, the edges of which have edge sections with small to large edge spacings, for example due to rough preprocessing.
  • the known arc electrode is guided by a special holder fixed to the nozzle. This configuration widens the welding head in an area where a slim design is important because of the large number of geometric shapes to be machined. In addition, this space-consuming design of the known device also impairs the interaction of the laser radiation with the arc in the sense of increased inaccuracy or inadequate superimposition of the processing areas of the laser beam and the arc.
  • the device is therefore designed in such a way that the nozzle is designed on the workpiece side as an arc electrode.
  • the nozzle is therefore used for arcing.
  • a special holder for an electrode and a specially designed arc electrode are therefore unnecessary.
  • the nozzle can be designed in such a way that the arc arises at the desired position, even behind the laser beam.
  • the nozzle is minimally removed from the laser beam, so that the processing points of the laser radiation and the arc always match optimally, even in the case of difficult geometries of the workpiece.
  • the device can also be designed so that the nozzle is designed as a ring electrode.
  • the arc can develop from the nozzle at all circumferential locations of the nozzle, so that optimum energy coupling into the processing area of the laser beam and low material stress on the nozzle are ensured due to the large base area.
  • the share of The thermal energy of the arc can be comparatively large compared to the thermal energy of the laser beam.
  • a nozzle for supplying gas to the processing point can also be designed in which the nozzle on the workpiece side at least partially consists of a non-conductive or poorly conductive material with which the end of the arc electrode is located just above the Processing point is held.
  • the nozzle wall can be used to bring the electrode as close or as close as possible to the laser beam, which is also particularly important when the distance between the nozzle and the workpiece surface is small.
  • the device is then advantageously designed such that the nozzle is made of ceramic. This material is easy to work according to the shape requirements and ensures optimum temperature resistance.
  • a device for processing workpieces with laser radiation which is optically focused on the relatively moved workpiece, with an arc electrode which is arranged in the vicinity of the laser beam and ends just above the machining point of the workpiece
  • the optics for focusing the laser radiation is a rod-shaped mirror arranged transversely to the relative feed direction of the workpiece and to which a rod-shaped arc electrode lies in parallel.
  • the guiding property of the laser beam in relation to the arc is used to move the latter transversely to the relative feed direction.
  • the arc seeks the path of least resistance from the electrode to the surface in the processing area pre-ionized by the laser beam.
  • spot welds can be carried out with a comparatively large penetration depth, for example, the seam width being approximately the same across the entire seam depth. This offers considerable advantages for the connection strength during welding or for the processing speed for surface treatment or also for the removal of enamel.
  • the device is designed such that the rod-shaped electrode is wedge-shaped and the wedge tip is arranged on the workpiece.
  • the wedge shape allows in particular a compromise between the mechanical requirements for the rigidity of the rod electrode and the endeavor to let the laser beam hit the workpiece surface as perpendicularly as possible.
  • the electrode is a non-melting electrode.
  • An adjustment device for the electrode in the direction of the workpiece surface can then be dispensed with.
  • the relative spatial assignment between the electrode, the laser beam and the workpiece is maintained without having to take into account the function of any wire feed device whose feed control would have to be adapted to the feed of the relatively moving workpiece.
  • FIG. 1 shows a cross-sectional representation of a machining point of a workpiece with an electrode tracking the laser beam in the relative feed direction
  • FIG. 2 shows a schematic representation of the curve shapes of laser pulses and arc curves as a function of time to explain a method in which the arc of the 3, an explanation of the effect of the method of FIG. 1,
  • FIG. 7 shows a schematic perspective illustration of a device for processing workpieces with scanning laser radiation.
  • FIG. 1 shows a schematic sectional illustration of a device for processing workpieces 10 with laser radiation of a laser beam 12, which is focused on the workpiece 10.
  • the workpiece 10 is shown schematically and is, for example, a thick sheet which is to be butt-welded over most of its thickness at two edges.
  • the welding depth t s extends practically over the entire workpiece thickness, for which purpose a steam channel 13 is formed with the aid of the laser radiation.
  • the material of the workpiece present in this area is evaporated to form a plasma and escapes from the steam channel 13 through the steam channel opening 19 in accordance with the arrows 30.
  • a relative feed must take place
  • the relative feed direction or the welding direction is designated 17 in Fig.l.
  • either the laser beam 12 is moved in this direction or the workpiece 10 in the opposite direction.
  • a welding front 23 forms from the steam channel 13.
  • the area of the liquid melt is comparatively narrow between this and the steam channel 10.
  • the liquid melt in this area is either evaporated or escapes behind the steam duct 13.
  • the liquid melt located behind the steam channel 13 cools and solidifies to the solid melt 24.
  • the area The liquid melt behind the steam channel 13 is correspondingly wide in accordance with the solidification behavior.
  • FIG. 1 shows that an electrode 16 is used to generate an arc 11 which is ignited in the area of the processing point 15 of the workpiece 10.
  • the end 14 of the electrode 16 is arranged very close to the laser beam 12.
  • the arc 11 seeks the path of least resistance from the electrode 16 to the workpiece 10, it burns where the laser beam hits the surface and ensures preionization.
  • the arc 11 is drawn into the steam capillary 13 and couples additional energy there, which ensures a correspondingly larger melting of the material of the workpiece 10.
  • FIG. 3 shows the weld depth ts.
  • the illustration on the left shows the appearance of a so-called LB seam, which was therefore produced exclusively using laser radiation.
  • a comparatively large welding depth t s , L can be seen, the width i, on the other hand the seam is comparatively narrow.
  • a TIG seam is shown which arises when an arc is used exclusively with a non-melting tungsten electrode.
  • the melting depth t s , wiG is small in comparison to the LB seam, while the width bwi G is larger.
  • This LB + TIG seam therefore has a comparatively large seam width the entire seam depth. This is primarily achieved in that the electrode 16, or its electrode end 14, which is arranged closely behind the laser beam 12 in the welding direction 17, the arc 11 allowed to pull deep into the interior of the steam duct 13.
  • the arrangement of the electrode end 14 in the welding direction behind the laser beam 12 allows the asymmetrical steam channel opening 19 to be used.
  • the latter has an extension 18 which is present opposite to the welding direction, through which the arc can enter the interior of the steam channel 13 without hindrance by liquid melt in the area between the axis 25 of the laser beam 12 and thus in the area of the absorption front in reach greater depths of the steam channel 13.
  • This in-depth coupling of the arc 11 onto the absorption front 23 leads to the uniform design of the seam cross-section as can be seen in FIG. or tulip shape. This means a considerable improvement for the possible uses of machining a workpiece with combined laser radiation / arc.
  • a first measure is to influence the laser radiation. This can be intensity-modulated or used in a pulsed manner as shown in FIG. The laser pulses follow one another at intervals. The electrode voltage between the electrode 16 and the metallic workpiece 10 ensures that the arc 11 is ignited in accordance with the pre-ionization by the laser beam in the region of the machining area. processing point 15. Since the intensity of the laser pulse shown increases very quickly, the arc is also ignited quickly and its intensity increases rapidly.
  • the arc can continue to burn for a short time and then goes out if its electrode voltage is dimensioned such that it is below the burning voltage. If this is not the case, the electrode voltage can be modulated accordingly or pulsed electrode voltage is used. In both cases, depending on the arrangement between workpiece 10, laser and electrode 16, a wavy course of the arc intensity or an extinguishing of the arc can be achieved. When the arc is extinguished, which should be the case at the points of the deep incisions in the lower illustration in FIG. 2, a further laser radiation pulse is used, which leads to renewed ignition of the arc.
  • the laser beam 12 moves relative to the workpiece 10, even if only by comparatively small lengths, it is nevertheless achieved by the new ignition of the arc 11 that this is in the area of the new one, due to the further laser radiation pulse generated, locally displaced steam channel 13 happens.
  • the result is a tracking of the arc 11, which does not have the possibility of remaining with respect to the laser beam which is moving on.
  • the laser beam thus guides the arc over the surfaces of the workpiece. This is from. of particular importance if the speed of the laser beam is comparatively high, such as, for example, with a scanning movement of the laser beam 12.
  • Such a scanning movement of the laser beam 12 is carried out with an arrangement according to FIG.
  • the laser beam 12 moves back and forth in directions 26 transversely to a feed direction 22 of a workpiece 10 constructed as sheet metal. It is fed in with a mirror optic 20, namely a strip-shaped flat deflection mirror 26 and a focusing mirror 27 with a flute-like configuration.
  • An electric arc is formed between the electrode 16, which is designed as a rod electrode, and the workpiece 10, which is metallic, so that the electrode voltage can be applied to the two aforementioned parts using a voltage source 28.
  • the rod-shaped Electrode 16 is wedge-shaped in cross section, wedge tip 29 being arranged on the workpiece side.
  • a plasma is created between the wedge tip 29 or the wedge tip edge of the electrode 16 and the workpiece 10, which is moved by the laser beam 12 in the directions 26 across the workpiece 10 in the directions 26 transverse to the feed direction 22.
  • the plasma must be guided in such a way that a continuous seam, seam sections or spot welds are formed in accordance with the processing purpose for numerous welding processes, unless corresponding drilling or cutting points, removal or surface treatment points are aimed for.
  • the device according to FIG. 4 can be designed such that a nozzle 21 is the arc electrode.
  • a protective gas and / or a reaction gas is fed to the processing point 15 with this nozzle.
  • this purging of the workpiece with gas is necessary, it is particularly advantageous to be able to dispense with an electrode 16 from the additional arrangement and to be able to use the anyway necessary metallic nozzle 21 instead of such an electrode in order to generate an arc. which improves the energy coupling at the processing point 15.
  • FIG. 4 shows the plasma achieved by the arc, the electrode end 14 being the nozzle tip, the distance from which can be kept very small from the surface of the workpiece.
  • the voltage source 28 for the electrode voltage is also shown in FIG.
  • the workpiece is electrically conductive. If this is not the case, a special electrode would have to be provided with which the arc is guided relative to the workpiece in the desired manner.
  • nozzle 21 is designed as a ring electrode and thus itself serves to generate the arc 11
  • a special electrode 16 is provided in addition to the nozzle 21 in the devices of FIGS. 5, 6. 5 shows a device which is particularly suitable for cutting. From the indicated cutting direction 17 there results a cutting front on which the material of the workpiece 10 is removed by melting and evaporation.
  • the required energy is comparatively high, so that for large cutting depths it is advisable to use the TIG electrode 16 in addition to the laser beam 12, the end 14 of which, in the immediate vicinity of the laser beam 12, just above the processing point 15 of the workpiece 10 is arranged, in the cutting direction 17 behind the laser beam 12, so that the arc 11 pulls into the kerf and meets the cutting front, where it is particularly helpful in laser beam fusion cutting.
  • FIG. 6 shows the formation of a device for melting, remelting, alloying and for two-stage coating.
  • the removal of material by the laser beam 12 over the height t s is supported in the region of the plasma by the arc 11, which is ignited between the electrode end 14 and the workpiece.
  • the nozzles 21 of FIGS. 5, 6 serve to hold the arc electrode 16 and must therefore consist of a non-conductive or poorly conductive material, at least in the holding area, since otherwise the arc 11 does not form from the electrode end 14 and would not be limited to the desired area.
  • a non-conductive or poorly conductive material is, for example, ceramic, insofar as it is temperature-resistant to the extent required.
  • the nozzle 21 expediently consists of non-melting material, for example tungsten, so that a predetermined formation of the arc 11 remains guaranteed.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Laser Beam Processing (AREA)

Abstract

Est décrit un procédé pour usiner des pièces (10) à l'aide d'un faisceau laser qui est focalisé sur la pièce (10) animée d'un mouvement relatif et ionise la matière. Outre le faisceau laser, un arc électrique (11) est utilisé dans la région de la pièce (10) frappée par le rayonnement laser. Afin de garantir que l'arc (11) ne persiste pas au niveau de son point de décharge, l'arc est amorcé avec un rayonnement laser modulé en intensité et/ou pulsé et/ou une tension aux électrodes pulsée et/ou modulée, et l'arc (11) s'éteint automatiquement après son amorçage ou bien sa tension aux électrodes est abaissée au-dessous de la tension de décharge, et l'arc est ensuite à nouveau amorcé.
PCT/DE1994/000971 1993-10-11 1994-08-22 Procede et dispositif pour l'usinage de pieces par faisceau laser WO1995010386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4334568A DE4334568A1 (de) 1993-10-11 1993-10-11 Verfahren und Vorrichtung zum Bearbeiten von Werkstücken mit Laserstrahlung
DEP4334568.9 1993-10-11

Publications (2)

Publication Number Publication Date
WO1995010386A1 true WO1995010386A1 (fr) 1995-04-20
WO1995010386B1 WO1995010386B1 (fr) 1995-06-29

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WO (1) WO1995010386A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19500512A1 (de) * 1994-09-23 1996-04-11 Fraunhofer Ges Forschung Verfahren zum Verschweißen von Werkstücken
DE60013397T2 (de) * 1999-03-16 2005-09-08 Hitachi Construction Machinery Co., Ltd. Verfahren zu führen eines lichtbogen mittels laser, schweissung mittels lichtbogenführung und vorrichtung zur durchführung dieser schweissung
DE19922169B4 (de) * 1999-05-12 2005-06-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Trennen/Schneiden von Bauteilen, Werkstücken und/oder Probekörpern beliebiger Dicke, Größe und weiterer Abmessungen aus Beton, Werkstein und anderen mineralischen Baustoffen mit wirtschaftlich vertretbaren Trennungsgeschwindigkeiten
DE19944466A1 (de) 1999-09-16 2001-03-22 Linde Gas Ag Verfahren und Vorrichtung zum Schutzgas-Hybridschweißen

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US4507540A (en) * 1982-10-06 1985-03-26 Agency Of Industrial Science & Technology Welding method combining laser welding and MIG welding
JPH01241392A (ja) * 1988-03-22 1989-09-26 Nippon Steel Corp Ｔｉｇとレーザの複合溶接方法
US5006688A (en) * 1988-10-24 1991-04-09 Westinghouse Electric Corp. Laser-arc apparatus and method for controlling plasma cloud

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US4507540A (en) * 1982-10-06 1985-03-26 Agency Of Industrial Science & Technology Welding method combining laser welding and MIG welding
JPH01241392A (ja) * 1988-03-22 1989-09-26 Nippon Steel Corp Ｔｉｇとレーザの複合溶接方法
US5006688A (en) * 1988-10-24 1991-04-09 Westinghouse Electric Corp. Laser-arc apparatus and method for controlling plasma cloud

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Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 577 (M - 910) 20 December 1989 (1989-12-20) *
W. M. STEEN: "Arc augmented laser processing of materials", JOURNAL OF APPLIED PHYSICS, vol. 51, no. 11, November 1980 (1980-11-01), NEW YORK US, pages 5636 - 5641 *

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